Fits perfectly on my Starrett caliper, fairly well made and appears to be hardened steel. The locking screw thread is also well-made with smooth running and excellent grip. The underside is perfectly straight (no light will penetrate when placed on a known flat surface) and measures true 90 degrees when mounted on my caliper (measured with Starrett's protractor). I considered the Starrett Deep Base but decided to try it first due to the significant difference in cost. I'm glad I did. There is simply no way to improve this article that could bring in 3-4 times more. To be honest I'm not sure if there is ANY improvement on this point. It meets all the requirements for precision and functionality.
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